科学素养与生活应用·英语30篇（4）

28 / 30

为何闪电更倾向击中高大物体与金属结构

Lightning seeks the path of least electrical resistance from cloud to ground during charge imbalance.
Tall objects reduce the insulating air gap, making ionization and leader formation easier.
Metal conducts electricity far better than wood or stone, so it attracts stepped leaders more readily.
But height matters more than material—trees often get struck even without metal content.
Grounding systems divert current safely into earth, preventing structural damage and fire.
Lightning rods work not by attracting strikes but by offering a controlled, low-resistance path.
Buildings with steel frames act as Faraday cages, protecting interior electronics from surges.
Charge accumulation differs across terrain: hills, towers, and lone trees become natural discharge points.
Modern aircraft avoid lightning damage using conductive skins that channel current around the cabin.
Understanding this physics helps engineers design safer infrastructure in storm-prone regions.